Large intestine of Dog

Large intestine of Dog

 Large intestine of Dog is 60 to 75 cm long. It has no bands or sacculations. The caecum is 12.5 to 15 cm It is situated midway between the right flank and median plane.

It extends as a blind diverticulum from the ileo-colic junction and is kept in a flexuous state by peritoneal folds. It opens cranially in to the colon.

Colon is attached to the sublumbar region by the mesocolon. It has three parts corresponding to the ascending, transverse, and descending colon of man

The first-right part (ascending) is very short passing forwards medial to the duodenum, reaches the pyloric part of the stomach. Here, it turns to the left crossing the median plane forming the transverse part

The third-left part (descending) passes back in the sublumbar region ventral to the left kidney and inclines to the median plane to be continued as the rectum

Colon is of uniform caliber throughout and is devoid of bands and sacculations.

The rectum is completely covered with peritoneum. At the junction of the rectum and anus the mucous membrane has stratified squamous epithelium and contains the anal glands

A small opening on either side leads into two lateral anal sacs of the size of a hazel nut containing a dirty grey fatty substance having a peculiar unpleasant odour.